20 wall dive sites in United Kingdom.
Biggest areas: Argyll and Bute (6), Scotland (4), Highland (2), Devon (1) and England (1).
Recorded maximum depths range from 7 m to 115 m (16 of 20 sites have a depth).
By level: 5 beginner, 3 intermediate, 4 advanced and 2 technical.
Species confirmed at these sites by diver sightings (three or more independent divers) or by two or more independent sources, with the number of sites each is confirmed at.